I'm trying this whole 'keep the thermostat low' thing and read post after post of people talking about the importance of wearing slippers. I have some old ones that, I swear, actually seem to make my feet feel colder. I figured this forum might be a good place to find out what kind I should look into. I'd like, obviously, to keep the price as reasonable as possible, but honestly I mostly just want something that will work and that I won't want to replace right away. Any suggestions?